Method and Device for Yarn Braking Especially at Renewal of Spinning in a Working Position of an Air Jet Spinning Machine

Abstract

The inventions relates to the method of yarn braking especially at renewal of spinning in a working position of an air jet spinning machine by means of attending a device provided with a vacuum tube (2), into which before commencement of braking there is the end of the yarn (100) sucked in, which at drawing off from the vacuum tube (2) is braked between the braking surfaces of a stationary brake friction member (50) and a moving brake friction member (30), which are arranged on the attending device displaceably to the track of the yarn (100), while for generating the braking force the moving brake friction member (30) moves towards the stationary brake friction member (50) and it fits against it at a contact abscissa (301) or a contact surface (302). To generate the braking force on the moving brake friction member (30) the action force in the loading point (Y) and the reaction force in the stop point (X) is acting, whereas one of these points is to be found at the end of the moving brake friction member (30) lying opposite to the contact abscissa (301) or the contact surface (302) and the second is lying between this member and the contact abscissa (301) or the contact surface (302), while the action force is generated by means of the control member (4) and the reaction force is generated by means of the stop (6), against which the moving brake friction member (30) leans, so that the braking surface of the moving brake friction member (30) always abuts against the braking surface of the stationary brake friction member (5) along the whole length of their contact abscissa (301) or contact surface (302).The inventions also relates to the corresponding device.

Description

TECHNICAL FIELD[0001]The invention relates to a method of yarn braking especially at renewal of spinning in a working position of an air jet spinning machine by means of attending a device provided with a vacuum tube, into which before commencement of braking there is the end of the yarn sucked in, which at drawing off from the vacuum tube is braked between the braking surfaces of stationary brake friction member and moving brake friction member, which are arranged on the attending device displaceably to the path of the yarn, while for generating the braking force the moving brake friction member moves towards the stationary brake friction member and it fits against it at a contact abscissa or a contact surface.[0002]Next to this the invention relates to a device for braking of the yarn especially at renewal of spinning in a working position of an air jet spinning machine by means of attending a device arranged displaceably along a line of working positions of the machine and provid...

AI Technical Summary

Benefits of technology

The invention relates to a braking device for vehicles. It has the advantage of easy regulation of braking force through a control member. The device also includes a pneumatic cylinder with a pressure regulator for precise and reliable functioning. The contact surfaces of the brake friction members are spherical, which enables easy swinging of the moving brake friction member in case of need. The stationary brake friction member is formed by a cylinder against which the moving brake friction member abuts upon braking. The brake friction member also includes a plane braking surface that increases the braking effect.

Problems solved by technology

By the effect of the magnetic force, the brake friction members pull to each other and clamp the yarn with the set force, which causes braking of the yarn.

The disadvantage of both the method and the device according to CZ 2007-629 A3 lies in the fact that the braking force is constant for one yarn diameter and it is difficult to change it when, in case it is needed technologically, yarn diameter changes.

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